Source for file sqlite.php

<?php
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1998-2004 Manuel Lemos, Tomas V.V.Cox,                 |
// | Stig. S. Bakken, Lukas Smith                                         |
// | All rights reserved.                                                 |
// +----------------------------------------------------------------------+
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// +----------------------------------------------------------------------+
// | Author: Lukas Smith <smith@backendmedia.com>                         |
// +----------------------------------------------------------------------+
//
// $Id: sqlite.php,v 1.4 2004/04/09 10:41:21 lsmith Exp $
//
 
require_once 'MDB2/Driver/Reverse/Common.php';
 
/**
 * MDB2 SQlite driver for the schema reverse engineering module
 *
 * @package MDB2
 * @category Database
 * @author  Lukas Smith <smith@backendmedia.com>
 */
class MDB2_Driver_Reverse_sqlite extends MDB2_Driver_Reverse_Common
{
    // }}}
    // {{{ constructor
 
    /**
     * Constructor
     */
    function MDB2_Driver_Reverse_sqlite($db_index)
    {
        $this->MDB2_Driver_Reverse_Common($db_index);
    }
 
    // }}}
    // {{{ getTableFieldDefinition()
 
    /**
     * get the stucture of a field into an array
     *
     * @param string    $table         name of table that should be used in method
     * @param string    $field_name     name of field that should be used in method
     * @return mixed data array on success, a MDB2 error on failure
     * @access public
     */
    function getTableFieldDefinition($table, $field_name)
    {
        $db =& $GLOBALS['_MDB2_databases'][$this->db_index];
        $query = "SELECT sql FROM sqlite_master WHERE type='table' AND name='$table'";
        $result = $db->query($query);
        if (MDB2::isError($result)) {
            return $result;
        }
        $columns = $result->getColumnNames();
        if (MDB2::isError($columns)) {
            return $columns;
        }
        if (!isset($columns[$column = 'sql'])) {
            return $db->raiseError(MDB2_ERROR, null, null,
                'getTableFieldDefinition: show columns does not return the column '.$column);
        }
        $sql=$result->fetch();
        if (MDB2::isError($columns = $this->_getTableColumns($sql))) {
            return $columns;
        }
        $count = count($columns);
 
        for ($i=0; $i<$count; ++$i) {
            if ($field_name == $columns[$i]['name']) {
                $db_type = $columns[$i]['type'];
                $type = array();
                switch ($db_type) {
                    case 'tinyint':
                    case 'smallint':
                    case 'mediumint':
                    case 'int':
                    case 'integer':
                    case 'bigint':
                        $type[0] = 'integer';
                        if ($columns[$i]['length'] && $columns[$i]['length'] == '1') {
                            $type[1] = 'boolean';
                            if (preg_match('/^[is|has]/', $field_name)) {
                                $type = array_reverse($type);
                            }
                        }
                        break;
                    case 'tinytext':
                    case 'mediumtext':
                    case 'longtext':
                    case 'text':
                    case 'char':
                    case 'varchar':
                    case "varchar2":
                        $type[0] = 'text';
                        if (isset($columns[$i]['length']) && $columns[$i]['length'] == '1') {
                            $type[1] = 'boolean';
                            if (preg_match('/[is|has]/', $field_name)) {
                                $type = array_reverse($type);
                            }
                        } elseif (strstr($db_type, 'text'))
                            $type[1] = 'clob';
                        break;
                    case 'enum':
                        preg_match_all('/\'.+\'/U',$row[$type_column], $matches);
                        $length = 0;
                        if (is_array($matches)) {
                            foreach ($matches[0] as $value) {
                                $length = max($length, strlen($value)-2);
                            }
                        }
                        unset($decimal);
                    case 'set':
                        $type[0] = 'text';
                        $type[1] = 'integer';
                        break;
                    case 'date':
                        $type[0] = 'date';
                        break;
                    case 'datetime':
                    case 'timestamp':
                        $type[0] = 'timestamp';
                        break;
                    case 'time':
                        $type[0] = 'time';
                        break;
                    case 'float':
                    case 'double':
                    case 'real':
                        $type[0] = 'float';
                        break;
                    case 'decimal':
                    case 'numeric':
                        $type[0] = 'decimal';
                        break;
                    case 'tinyblob':
                    case 'mediumblob':
                    case 'longblob':
                    case 'blob':
                        $type[0] = 'text';
                        break;
                    case 'year':
                        $type[0] = 'integer';
                        $type[1] = 'date';
                        break;
                    default:
                        return $db->raiseError(MDB2_ERROR, null, null,
                            'getTableFieldDefinition: unknown database attribute type');
                }
                for ($field_choices = array(), $datatype = 0;
                    $datatype < count($type);
                    $datatype++
                ) {
                    $field_choices[$datatype] = array('type' => $type[$datatype]);
                    if (isset($columns[$i]['notnull'])) {
                        $field_choices[$datatype]['notnull'] = true;
                    }
                    if (isset($columns[$i]['default'])) {
                        $field_choices[$datatype]["default"]=$columns[$i]['default'];
                    }
                    if ($type[$datatype] != 'boolean'
                        && $type[$datatype] != 'time'
                        && $type[$datatype] != 'date'
                        && $type[$datatype] != 'timestamp')
                    {
                        if (isset($columns[$i]['length'])) {
                            $field_choices[$datatype]['length'] = $columns[$i]['length'];
                        }
                    }
                }
                $definition[0] = $field_choices;
/*
                if (isset($columns['extra'])
                    && isset($row[$columns['extra']])
                    && $row[$columns['extra']] == 'auto_increment')
                {
                    $implicit_sequence = array();
                    $implicit_sequence['on'] = array();
                    $implicit_sequence['on']['table'] = $table;
                    $implicit_sequence['on']['field'] = $field_name;
                    $definition[1]['name'] = $table.'_'.$field_name;
                    $definition[1]['definition'] = $implicit_sequence;
                }
                if (isset($columns['key'])
                    && isset($row[$columns['key']])
                    && $row[$columns['key']] == 'PRI')
                {
                    // check that its not just a unique field
                    if (MDB2::isError($indexes = $db->query("SHOW INDEX FROM $table", null, MDB2_FETCHMODE_ASSOC))) {
                        return $indexes;
                    }
                    $is_primary = false;
                    foreach ($indexes as $index) {
                        if ($index['key_name'] == 'PRIMARY' && $index['column_name'] == $field_name) {
                            $is_primary = true;
                            break;
                        }
                    }
                    if ($is_primary) {
                        $implicit_index = array();
                        $implicit_index['unique'] = true;
                        $implicit_index['fields'][$field_name] = '';
                        $definition[2]['name'] = $field_name;
                        $definition[2]['definition'] = $implicit_index;
                    }
                }
*/
                return $definition;
            }
        }
        $result->free();
 
        if (MDB2::isError($row)) {
            return $row;
        }
        return $db->raiseError(MDB2_ERROR, null, null,
            'getTableFieldDefinition: it was not specified an existing table column');
    }
 
    // }}}
    // {{{ getTableIndexDefinition()
 
    /**
     * get the stucture of an index into an array
     *
     * @param string    $table      name of table that should be used in method
     * @param string    $index_name name of index that should be used in method
     * @return mixed data array on success, a MDB2 error on failure
     * @access public
     */
    function getTableIndexDefinition($table, $index_name)
    {
        $db =& $GLOBALS['_MDB2_databases'][$this->db_index];
        if ($index_name == 'PRIMARY') {
            return $db->raiseError(MDB2_ERROR, null, null,
                'getTableIndexDefinition: PRIMARY is an hidden index');
        }
        $query = "SELECT sql FROM sqlite_master WHERE type='index' AND name='$index' AND tbl_name='$table' AND sql NOT NULL ORDER BY name";
        $result = $db->query($query);
        if (MDB2::isError($result)) {
            return $result;
        }
        $columns = $result->getColumnNames();
        $column = 'sql';
        if (!isset($columns[$column])) {
            $result->free();
            return $db->raiseError('getTableIndexDefinition: show index does not return the table creation sql');
        }
 
        $sql = strtolower($result->fetch());
        $unique = strstr($sql, " unique ");
        $key_name = $index;
        $start_pos = strpos($sql, "(");
        $end_pos = strrpos($sql, ")");
        $column_names = substr($sql, $start_pos+1, $end_pos-$start_pos-1);
        $column_names = split(",", $column_names);
 
        $definition = array();
        if ($unique) {
            $definition['unique'] = true;
        }
        $count = count($column_names);
        for ($i=0; $i<$count; ++$i) {
            $column_name = strtok($column_names[$i]," ");
            $collation = strtok(" ");
            $definition['fields'][$column_name] = array();
            if (!empty($collation)) {
                $definition['fields'][$column_name]['sorting'] = ($collation=='ASC' ? 'ascending' : 'descending');
            }
        }
 
        $result->free();
        if (!isset($definition['fields'])) {
            return $db->raiseError(MDB2_ERROR, null, null,
                'getTableIndexDefinition: it was not specified an existing table index');
        }
        return $definition;
    }
}
 
?>